Ni-Doped MoS2 Nanoparticles Prepared via Core-Shell Nanoclusters and Catalytic Activity for Upgrading Heavy Oil

Gwangsik Jeong, Chan Hun Kim, Young Gul Hur, Geun Ho Han, Seong Ho Lee, Kwan Young Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The general hydrotreatment catalyst is an alumina supported molybdenum sulfide catalyst which is usually promoted by cobalt and nickel. However, supported catalysts are easily deactivated because of a high portion of asphaltenes, which cause pore-plugging and mass transfer limitation. For this reason, recent studies are focused on unsupported nanocatalysts especially for slurry reactor application. To synthesize nanomaterials, generally, there are top-down methods such as sputtering and bottom-up methods using chemical precursors to synthesize nanomaterials. Since the synthesis of nanomaterials with complex chemical formulas is limited in the top-down method, the bottom-up method through liquid phase reaction is mostly used. However, in the case of nanomaterials produced in the liquid phase, a calcination process is sequentially needed in order to obtain the desired crystallinity and to remove impurities. Even if it succeeds in synthesizing uniform and nanosized materials in the liquid phase process, it is difficult to finally obtain nanomaterials due to particle growth by sintering between nanomaterials in the calcination process. This study presents a new synthetic approach of Ni-doped MoS2 nanoparticles via core-shell nanoclusters, enabling control of the crystallization and the size of the target nanomaterials even after a high temperature calcination process. The Ni-doped MoS2 (Ni/Mo weight ratio = 0.45) nanoparticle exhibited the highest catalytic performance. The slab structures and surface oxidation states of the nanoparticles were investigated according to the amount of doped Ni through the analysis of TEM and XPS characteristics and also related to the catalytic performances of heavy oil upgrading.

Original languageEnglish
JournalEnergy and Fuels
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Nanoclusters
Nanostructured materials
Catalyst activity
Crude oil
Nanoparticles
Calcination
Liquids
Catalysts
Asphaltenes
Aluminum Oxide
Crystallization
Cobalt
Nickel
Catalyst supports
Molybdenum
Sputtering
Alumina
Sintering
Mass transfer
X ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Ni-Doped MoS2 Nanoparticles Prepared via Core-Shell Nanoclusters and Catalytic Activity for Upgrading Heavy Oil. / Jeong, Gwangsik; Kim, Chan Hun; Hur, Young Gul; Han, Geun Ho; Lee, Seong Ho; Lee, Kwan Young.

In: Energy and Fuels, 01.01.2018.

Research output: Contribution to journalArticle

@article{d9017971fac04ec2867e1f863ef6898f,
title = "Ni-Doped MoS2 Nanoparticles Prepared via Core-Shell Nanoclusters and Catalytic Activity for Upgrading Heavy Oil",
abstract = "The general hydrotreatment catalyst is an alumina supported molybdenum sulfide catalyst which is usually promoted by cobalt and nickel. However, supported catalysts are easily deactivated because of a high portion of asphaltenes, which cause pore-plugging and mass transfer limitation. For this reason, recent studies are focused on unsupported nanocatalysts especially for slurry reactor application. To synthesize nanomaterials, generally, there are top-down methods such as sputtering and bottom-up methods using chemical precursors to synthesize nanomaterials. Since the synthesis of nanomaterials with complex chemical formulas is limited in the top-down method, the bottom-up method through liquid phase reaction is mostly used. However, in the case of nanomaterials produced in the liquid phase, a calcination process is sequentially needed in order to obtain the desired crystallinity and to remove impurities. Even if it succeeds in synthesizing uniform and nanosized materials in the liquid phase process, it is difficult to finally obtain nanomaterials due to particle growth by sintering between nanomaterials in the calcination process. This study presents a new synthetic approach of Ni-doped MoS2 nanoparticles via core-shell nanoclusters, enabling control of the crystallization and the size of the target nanomaterials even after a high temperature calcination process. The Ni-doped MoS2 (Ni/Mo weight ratio = 0.45) nanoparticle exhibited the highest catalytic performance. The slab structures and surface oxidation states of the nanoparticles were investigated according to the amount of doped Ni through the analysis of TEM and XPS characteristics and also related to the catalytic performances of heavy oil upgrading.",
author = "Gwangsik Jeong and Kim, {Chan Hun} and Hur, {Young Gul} and Han, {Geun Ho} and Lee, {Seong Ho} and Lee, {Kwan Young}",
year = "2018",
month = "1",
day = "1",
doi = "10.1021/acs.energyfuels.8b02092",
language = "English",
journal = "Energy and Fuels",
issn = "0887-0624",
publisher = "American Chemical Society",

}

TY - JOUR

T1 - Ni-Doped MoS2 Nanoparticles Prepared via Core-Shell Nanoclusters and Catalytic Activity for Upgrading Heavy Oil

AU - Jeong, Gwangsik

AU - Kim, Chan Hun

AU - Hur, Young Gul

AU - Han, Geun Ho

AU - Lee, Seong Ho

AU - Lee, Kwan Young

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The general hydrotreatment catalyst is an alumina supported molybdenum sulfide catalyst which is usually promoted by cobalt and nickel. However, supported catalysts are easily deactivated because of a high portion of asphaltenes, which cause pore-plugging and mass transfer limitation. For this reason, recent studies are focused on unsupported nanocatalysts especially for slurry reactor application. To synthesize nanomaterials, generally, there are top-down methods such as sputtering and bottom-up methods using chemical precursors to synthesize nanomaterials. Since the synthesis of nanomaterials with complex chemical formulas is limited in the top-down method, the bottom-up method through liquid phase reaction is mostly used. However, in the case of nanomaterials produced in the liquid phase, a calcination process is sequentially needed in order to obtain the desired crystallinity and to remove impurities. Even if it succeeds in synthesizing uniform and nanosized materials in the liquid phase process, it is difficult to finally obtain nanomaterials due to particle growth by sintering between nanomaterials in the calcination process. This study presents a new synthetic approach of Ni-doped MoS2 nanoparticles via core-shell nanoclusters, enabling control of the crystallization and the size of the target nanomaterials even after a high temperature calcination process. The Ni-doped MoS2 (Ni/Mo weight ratio = 0.45) nanoparticle exhibited the highest catalytic performance. The slab structures and surface oxidation states of the nanoparticles were investigated according to the amount of doped Ni through the analysis of TEM and XPS characteristics and also related to the catalytic performances of heavy oil upgrading.

AB - The general hydrotreatment catalyst is an alumina supported molybdenum sulfide catalyst which is usually promoted by cobalt and nickel. However, supported catalysts are easily deactivated because of a high portion of asphaltenes, which cause pore-plugging and mass transfer limitation. For this reason, recent studies are focused on unsupported nanocatalysts especially for slurry reactor application. To synthesize nanomaterials, generally, there are top-down methods such as sputtering and bottom-up methods using chemical precursors to synthesize nanomaterials. Since the synthesis of nanomaterials with complex chemical formulas is limited in the top-down method, the bottom-up method through liquid phase reaction is mostly used. However, in the case of nanomaterials produced in the liquid phase, a calcination process is sequentially needed in order to obtain the desired crystallinity and to remove impurities. Even if it succeeds in synthesizing uniform and nanosized materials in the liquid phase process, it is difficult to finally obtain nanomaterials due to particle growth by sintering between nanomaterials in the calcination process. This study presents a new synthetic approach of Ni-doped MoS2 nanoparticles via core-shell nanoclusters, enabling control of the crystallization and the size of the target nanomaterials even after a high temperature calcination process. The Ni-doped MoS2 (Ni/Mo weight ratio = 0.45) nanoparticle exhibited the highest catalytic performance. The slab structures and surface oxidation states of the nanoparticles were investigated according to the amount of doped Ni through the analysis of TEM and XPS characteristics and also related to the catalytic performances of heavy oil upgrading.

UR - http://www.scopus.com/inward/record.url?scp=85052857527&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85052857527&partnerID=8YFLogxK

U2 - 10.1021/acs.energyfuels.8b02092

DO - 10.1021/acs.energyfuels.8b02092

M3 - Article

AN - SCOPUS:85052857527

JO - Energy and Fuels

JF - Energy and Fuels

SN - 0887-0624

ER -